Ground-Water Information Center Water Quality Report Site Name: LCWQPD MOTOR POOL EAST WELL Report Date: 4/25/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 2003Q0293 / 191540 Sample Date: 8/19/2002 4:40:00 PM Location (TRS): 10N 03W 28 CDBB Agency/Sampler: MBMG / JPM Latitude/Longitude: 46° 35' 25" N 111° 59' 40" W Field Number: 191540 Datum: WGS84 Lab Date: 11/25/2002 Altitude: 4012.858 Lab/Analyst: MBMG / KTH County/State: LEWIS AND CLARK / MT Sample Method/Handling: / 3120 Site Type: WELL Procedure Type: DISSOLVED Geology: 120SDMS Total Depth (ft): 61 USGS 7.5' Quad: EAST HELENA SWL-MP (ft): 34.07 PWS Id: Depth Water Enters (ft): 51 Project: LCWQPD, GWAAMON, COLIPHAGE Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 27.200 1.357 Bicarbonate (HCO3) 214.000 3.507 Magnesium (Mg) 20.500 1.687 Carbonate (CO3) 0.000 0.000 Sodium (Na) 110.000 4.785 Chloride (Cl) 61.000 1.721 Potassium (K) 7.370 0.189 Sulfate (SO4) 114.000 2.375 Iron (Fe) 0.016 0.001 Nitrate (as N) 2.100 0.150 Manganese (Mn) 0.005 0.000 Fluoride (F) 0.630 0.033 Silica (SiO2) 39.200 Orthophosphate (as P) <.5 0.000 Total Cations 8.066 Total Anions 7.786 Trace Element Results (µg/L) Aluminum (Al): <30 Cesium (Cs): NR Molybdenum (Mo): 40.600 Strontium (Sr): 269.000 Antimony (Sb): <10 Chromium (Cr): <10 Nickel (Ni): 15.100 Thallium (Tl): <20 Arsenic (As): 15.600 Cobalt (Co): <2 Niobium (Nb): NR Thorium (Th): NR Barium (Ba): 56.400 Copper (Cu): <5 Neodymium (Nd): NR Tin (Sn): NR Beryllium (Be): <2 Gallium (Ga): NR Palladium (Pd): NR Titanium (Ti): <1 Boron (B): 448.000 Lanthanum (La): NR Praseodymium (Pr): NR Tungsten (W): NR Bromide (Br): 642.000 Lead (Pb): <10 Rubidium (Rb): NR Uranium (U): NR Cadmium (Cd): <1 Lithium (Li): 11.500 Silver (Ag): NR Vanadium (V): 13.200 Cerium (Ce): NR Mercury (Hg): NR Selenium (Se): <15 Zinc (Zn): <2 Zirconium (Zr): <2 Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 487.12 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 595.7 Hardness as CaCO3: 152.3 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 820 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 804 Alkalinity as CaCO3 (mg/L): 175.52 Phosphorus, TD (mg/L): <0.05 Field pH: 7.85 Ryznar Stability Index: 7.782 Field Nitrate (mg/L): NR Lab pH: 7.86 Sodium Adsorption Ratio: 3.8785 Field Dissolved O2 (mg/L): NR Water Temp (°C): 16.6 Langlier Saturation Index: 0.039 Field Chloride (mg/L): NR Air Temp (°C): NR Nitrite (mg/L as N): <.05 Field Redox (mV): NR Nitrate + Nitrite (mg/L as N) NR Hydroxide (mg/L as OH): NR Lab, Dissolved Organic Carbon (mg/L): NR Total Kjeldahl Nitrogen (mg/L as N) NR Lab, Dissolved Inorganic Carbon (mg/L): NR Lab, Total Organic Carbon (mg/L): NR Total Nitrogen (mg/L as N) NR Acidity to 4.5 (mg/L CaCO3) NR Acidity to 8.3 (mg/L CaCO3) NR As(III) (ug/L) NR As(V) (ug/L) NR Total Susp Solids (mg/L) NR Notes Sample Condition: SLIGHTLY TURBID Field Remarks: Lab Remarks:

Explanation: mg/L = milligrams per Liter; µg/L = micrograms per Liter; ft = feet; NR = No Reading in GWIC Qualifiers: J = Estimated quantity above detection limit but below reporting limit; P = Preserved sample; S = Method of standard additions; U = Undetected quantity below detection limit; * = Duplicate analysis not within control limits; ** = Sum of Dissolved Constituents is the sum of major cations (Na, Ca, K, Mg, Mn, Fe) and anions (HCO3, CO3, SO4, Cl, SiO2, NO3, F) in mg/L. Total Dissolved Solids is reported as equivalent weight of evaporation residue. Disclaimer These data represent the contents of the GWIC databases at the Montana Bureau of Mines and Geology at the time and date of the retrieval. The information is considered unpublished and is subject to correction and review on a daily basis. The Bureau warrants the accurate transmission of the data to the original end user. Retransmission of the data to other users is discouraged and the Bureau claims no responsibility if the material is retransmitted.